docs: def sia_concept_style(subsystem):
      """Compute a concept-style SystemIrreducibilityAnalysis"""
      unpartitioned_ces = _ces(subsystem)
  
      sia_cause = directional_sia(subsystem, Direction.CAUSE,
                                  unpartitioned_ces)
      sia_effect = directional_sia(subsystem, Direction.EFFECT,
                                   unpartitioned_ces)
  
      return SystemIrreducibilityAnalysisConceptStyle(sia_cause, sia_effect)